Analog Devices Inc./Maxim Integrated MAX6738XKVD7

Overview

The MAX6738XKVD7 from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed reset threshold (VTH1 = 2.925 V) and one adjustable reset input (RSTIN, 0.488 V reference), open-drain active-low RESET output, manual reset input (MR), and 1200 ms minimum reset timeout period. It monitors primary I/O supply (VCC1) and secondary core supply (VCC2) in portable and multivoltage systems, ensuring reliable µP reset during brownout or power-up sequencing.

For engineers reviewing the MAX6738XKVD7 datasheet, MAX6738XKVD7 pinout, MAX6738XKVD7 application, or MAX6738XKVD7 equivalent, this device supports precise dual-rail monitoring down to 0.9 V core supplies, delivers ultra-low 6 µA quiescent current, and integrates RSTIN for flexible external voltage monitoring - critical for battery-powered controllers, GPS modules, and POS terminals requiring stable, low-power supervision.

Technical Context

The MAX6738XKVD7 implements independent dual-supply monitoring: VCC1 (1.8–5.0 V) and VCC2 (0.9–3.3 V), with factory-set VTH1 = 2.925 V (suffix 'S') and VTH2 = 2.188 V (suffix 'Y'), per Table 2. Its RSTIN input accepts externally scaled voltages via resistor divider, referenced to a precision 0.488 V internal bandgap.

Reset assertion occurs when any monitored rail falls below its threshold; RESET remains low for ≥1200 ms after all rails recover. The open-drain RESET output requires an external pullup, and MR provides CMOS-compatible active-low manual reset with 150–300 µs glitch rejection and internal 1.5 kΩ pullup to VCC1.

Key Specifications

Pinout & Package

MAX6738XKVD7 is housed in a 5-pin SC70 package (2.0 mm × 1.25 mm × 0.9 mm body, 0.65 mm pitch). Pin 1 is RESET (open-drain active-low), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is VCC2 (secondary supply input), and Pin 5 is VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisor applications.

Compared with MAX6738XKTD3, the MAX6738XKVD7 provides 8× longer reset hold time for robust initialization; compared with TPS3808G18DBVR, it eliminates the need for external components to achieve dual-supply supervision, reducing design risk and board area.

Availability

MAX6738XKVD7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, handheld barcode scanners, and automotive infotainment subsystems requiring stable component supply across extended production lifecycles.

Supply support for MAX6738XKVD7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6736–MAX6745 family was engineered specifically for low-power, space-constrained multivoltage systems - delivering dual/triple-rail supervision in sub-3 mm² SC70 packages with <10 µA quiescent current.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6738XKVD7?

The MAX6738XKVD7 has a factory-trimmed VCC1 reset threshold of 2.925 V (±0.075 V over −40°C to +85°C), indicated by the 'S' suffix in its part number. This value is guaranteed per Table 2 of the datasheet and applies specifically to the MAX6738XKVD7, not the broader MAX6738 family.

Does the MAX6738XKVD7 support monitoring a third voltage rail?

Yes - the MAX6738XKVD7 includes an RSTIN pin with a precise 0.488 V internal reference, allowing external resistor-divider networks to scale and monitor a third voltage rail (e.g., 1.2 V, 1.8 V, or battery voltage). Input leakage is <10 nA, enabling high-value resistors for minimal power draw.

What is the function of the MR pin on the MAX6738XKVD7?

The MR pin on the MAX6738XKVD7 is an active-low manual reset input with internal 1.5 kΩ pullup to VCC1. Pulling MR low for ≥1 µs forces RESET low; RESET remains asserted for the full 1200 ms timeout after MR returns high. It supports direct connection to pushbutton switches or logic signals without external components.

Is the RESET output of the MAX6738XKVD7 push-pull or open-drain?

The RESET output of the MAX6738XKVD7 is open-drain active-low, requiring an external pullup resistor to VCC1 or another logic rail. This configuration allows wired-OR connectivity and compatibility with bidirectional µP reset pins, unlike push-pull variants such as MAX6737 or MAX6739.

What package type and dimensions does the MAX6738XKVD7 use?

The MAX6738XKVD7 uses a 5-pin SC70 package measuring 2.0 mm × 1.25 mm × 0.9 mm with 0.65 mm lead pitch. Its small footprint and low profile make it suitable for ultra-compact PCBs in portable and wearable electronics where board space is constrained.